i bought Denon's newly released AH-D1100 a couple of weeks ago, and am enjoying them. i play my music straight through a macbook pro with no additional amplifier or dac.
the bass is unbloated (i listen to rock/indie/post punk) and there is enough detail to keep me happy 🙂 however i find the treble a little harsh at times, this could be due to having young ears though. they don't leak much sound i don't think, but if im wearing them how could i tell .
they are on ebay now for around £100. unfortunately there arent may review at the moment, and what hifi themselves havent reviewed them either 🙁 the only things i can compare them to are denons top end in-ears and a few others (akg, Nu-Force and Bose), and they are better in every way. the bass you can hear goes very low, but its not loud and boomy, just good response, kick drums for example sound accurate but not over exaggerated.
but I would say i like them, you should visit a few shops and have a listen to some